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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Vertikaliojo tinklo linijos Jonava - Zarasai niveliavimo rezultatų analizė / Analysis of the leveling results of vertical network line Jonava – Zarasai

Norkutė, Sigita 16 June 2011 (has links)
Baigiamajame magistro darbe analizuojami Lietuvos geodezinio vertikaliojo pirmosios klasės tinklo linijos Jonava – Zarasai niveliavimo rezultatai. Darbe apžvelgtos vertikaliojo tinklo sudarymo nuostatos, šalies dalyvavimas tarptautiniuose projektuose, sudarytas vertikalusis pirmosios klasės tinklas, vertikaliojo tinklo sudarymo metodika bei prietaisai ir priemonės, naudojami šio tinklo matavimuose. Darbe pateikti eksperimentiniai nivelyrų sistemos kalibravimo rezultatai ir pavienių matuoklių kalibravimo rezultatai. Pateikiama niveliavimo duomenų apdorojimo metodika. Baigiamajame darbe pagal nivelyrų sistemos bei pavienių matuoklių kalibravimo rezultatus nagrinėjamos kalibravimo, refrakcijos ir temperatūros pataisos, analizuojamas nesąryšių ir temperatūros kitimas vertikaliojo tinklo linijoje Jonava – Zarasai, skaičiuojamas niveliavimo rezultatų tikslumas. Darbo pabaigoje pateikiamos išvados. Darbą sudaro: įvadas, 4 skyriai , išvados, literatūros ir kitų šaltinių sąrašas. Darbo apimtis – 70 p. teksto be priedų, 44 iliustr., 11 lent., 34 bibliografiniai šaltiniai. Atskirai pridedami darbo priedai. / Master's thesis aim - analysis of the levelling results of the vertical network line Jonava – Zarasai. At work is described technical regulations of the vertical network, first order vertical network and also used measurement technique. At work is presented experimental results of digital levels system calibration and results of levelling stuffs calibration. By these results in this work is performed analysis of refraction, calibration and temperature corrections, and also analysis of the air temperature and heights differences mismatching. At work also was calculated leveling accuracy. In the end of the work is presented conclusions. Structure: introduction, 4 chapters, conclusions and suggestions, references. Thesis consist of: 70p. text without appendixes, 44 pictures, 11tables, 34 bibliographical entries. Appendixes included.
2

Uticaj prevremenog rođenja na rast oka i proces emetropizacije / The impact of preterm birth on eye growth and process of emmetropisation

Grgić Zorka 31 March 2016 (has links)
<p>Stopa prematuriteta konstantno raste, a sve vi&scaron;e prevremeno rođenih beba koje prežive neonatalni i perinatalni period zahteva adekvatno sistemsko i oftalmolo&scaron;ko praćenje i tretman. Prematuritet sam po sebi, predstavlja rizik za razvoj vida. Taj rizik dodatno povećava prisustvo prematurne retinopatije i refraktivnih mana. Skrining i tretman promena na retini u sklopu prematuriteta, kao i optička korekcija refraktivnih mana obezbeđuju uslove za razvoj vida. Cilj ovog istraživanja je bio utvrditi promene biometrijskih karakteristika oka prematurusa, sa i bez prematurne retinopatije, tokom &scaron;estogodi&scaron;njeg praćenja, utvrditi refraktivni status ove dve grupe dece sa &scaron;est godina, te povezati promene biometrijskih karakteristika oka sa refrakcijom. U ispitivanje je uključeno 192 prevremeno rođena deteta (384 oka). Vr&scaron;ena su tri pregleda, u uzrastu od 3 meseca, 12 meseci i 6 godina starosti. Nakon prvog pregleda ispitivani uzorak je, u zavisnosti od nalaza na očnom dnu, podeljen na bebe sa prematurnom retinopatijom i bebe bez ovog oboljenja, a kako bi se uporedile proučavane karakteristike. U sva tri navedena uzrasta je pregledano očno dno i merene su tri glavne biometrijske karakteristike koje utiču na refraktivni status: aksijalna dužina oka, dubina prednje očne komore i debljina očnog sočiva. Sa &scaron;est godina je određena refrakcija, uključujući zakrivljenost rožnjače odnosno kornealni astigmatizam, vidna o&scaron;trina bez korekcije refraktivne mane, a zatim i nakon korekcije. Ostali neophodni podaci su dobijeni iz medicinske dokumentacije. Pokazano je da prematurna retinopatija utiče na refraktivni status i vidni ishod sa &scaron;est godina, pre svega uticajem na zakrivljenost rožnjače, aksijalnu dužinu oka i dubinu prednje očne komore, dok su promene debljine očnog sočiva bez posebnog značaja. Vidne o&scaron;trine oba oka u pred&scaron;kolskom uzrastu prevremeno rođene dece sa prematurnom retinopatijom su statistički značajno manje kada se uporede sa vidnim o&scaron;trinama prevremeno rođene dece bez retinopatije, ali razlika u ovim dvema vrednostima gubi statističku značajnost nakon optičke korekcije. Učestalost astigmatizma u prematurnoj populaciji sa 6 godina je visoka, a od onih koji imaju astigmatizam u tom uzrastu, vi&scaron;e od dve trećine je imalo prematurnu retinopatiju. Ukupna učestalost miopije, hipermetropije i emetropije u prematurnoj populaciji sa 6 godina je 18,9%, 54,7% i 13,2%, a preostalih 13,2% su anizometropi. U vi&scaron;e od trećine dece, sa prematurnom retinopatijom u najranijem uzrastu, sa &scaron;est godina postoji gubitak vidne sposobnosti, koji je najče&scaron;će blag, no može biti i potpun.</p> / <p>The number of babies born prematurely is constantly growing, so more and more of them need appropriate systemic and ophthalmologic monitoring and treatament. Prematurity itself, represents a risk for the development of vision. This risk further reinforces the presence of retinopathy of prematurity and refractive errors. Screening and treatment of retinopathy, as well as optical correction of refractive errors provide adequate conditions for the development of vision. The aim of this study was to determine changes of biometric features of eyes of the prematurely born infants, with and without retinopathy of prematurity, during the six-year follow-up. We also want to determine the refractive status of these two groups of children in the six year, and to link changes of biometric features with their eye refraction. The study included 192 prematurely born children (384 eyes). The examinations were performed at 3 months, 12 months and 6 years and they included fundus examination and measurements of the ocular axial length, anterior chamber depth and lens thickness. After dividing the subjects into two groups, based on the results of the fundus examination at 3 months, the results of the children with and without retinopathy were compared. At the age of six we also determine the refraction of eyes, including the curvature of the cornea and corneal astigmatism, visual acuity without correction of refractive error, and then after it. Other necessary data were obtained from medical documentation. It is shown that retinopathy of prematurity affects the refractive status and visual outcome at sixth year, primarily by the changes of curvature of the cornea, the axial length of the eye and the depth of the anterior chamber, while the change in the lens thickness has no significance. Visual acuity in both eyes in the preschool age preterm born children with retinopathy of prematurity are significantly less, when compared to visual acuity in preterm infants without retinopathy, but the difference in these two values lost statistical significance after optical correction. The rate of astigmatism in preterm population of six years is high, and of those who have astigmatism in this age group, more than two-thirds had retinopathy of prematurity. The overall incidence of myopia, hypermetropia and emetropia in the prematurely born, six years old children is 18.9%, 54.7% and 13.2%, and the remaining 13.2% have anisometropia. In more than a third of children with retinopathy of prematurity at an early age, with six years, there has been loss of visual acuity, which is usually mild, but it can be complete.</p>

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